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Vertical Diffusion Coefficient with Stratification Effect for Silty Sediment Suspension Under Waves

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Abstract

To analyze previous experimental data of suspended sediment concentration for silty sediment with different sediment particle sizes due to waves, a new stratification correction coefficient is presented. The suspended sediment concentration gradient and sediment particle diameter are selected as parameters. Furthermore, a diffusion coefficient model with a stratification effect over the whole water depth for silty sediment suspension under waves is developed. The comparison between the suspended sediment concentration calculated by the presented model and several groups of experimental data shows that the model can reasonably reflect the vertical distribution of silty sediment suspension. The stratification effect calculated by the present model decreases with an increase in the sediment particle diameter, which indicates that the model can be extended to describe the suspended sediment concentration of fine to medium sand when the near-bottom sediment concentration is not very high. Although the original model needs to be iteratively solved, the approximate method without iteration is recommended for applications when the near bottom sediment concentration is between 10 and 20 kg/m3 due to the small difference between the non-iterative and iterative solution for near bed layer suspended sediment concentration, which plays a major role in sediment transport.

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Authors and Affiliations

  1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin, 300072, China

    Guang-yao Yang & Qing-he Zhang

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  1. Guang-yao Yang
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  2. Qing-he Zhang
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Correspondence to Qing-he Zhang.

Additional information

Foundation item: This study was financially supported by NSFC—Shandong Joint Fund Project (Grant No. U1906231).

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Yang, Gy., Zhang, Qh. Vertical Diffusion Coefficient with Stratification Effect for Silty Sediment Suspension Under Waves. China Ocean Eng 37, 323–332 (2023). https://doi.org/10.1007/s13344-023-0018-2

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  • DOI: https://doi.org/10.1007/s13344-023-0018-2

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